Studies for the reaction rates of radicals in interstellar space and planetary atmosphere

本文用激光诱导荧光法测量了C_2H自由基的反应速率。C_2H在星际空间或行星大气中的光化学过程中起着重要的作用。所测量的LIF信号是基于C_2H的B态，观察到四个光谱系列。这些光谱分别归属于α-β，α-β，Δ-Δ，α-β跃迁.通过对光谱的详细分析，确定了C_2H的电子态性质和与乙炔的反应速率。另一方面，在10 K下，用氩基体法研究了C_2H自由基在低温固相中的光化学过程。C_2H与乙炔反应生成二乙炔。量子产率大于1。这意味着在低温固相中存在纳米爆炸。这对不饱和烃在星际空间或行星大气中的反应机理研究具有重要意义。

The reaction rates of C_2H radicals have been measured using the LIF method. The C_2H plays an important role for the photochemical process in interstellar space or planetary atmosphere. The measured LIF signal is based on B state of C_2H, and four spectra series was observed. These spectra can be assigned toΣ-Σ,Π-Π,Δ-Δ,Ф-Ф transition, respectively. The detailed analysis of a spectrum shows that the properties of the electronic state of C_2H and reaction rate with acetylene have be determined. On the other hand, photochemical process of C_2H radical in solid phase at low temperature has been investigated using the argon matrix method at 10K. Diacetylene formation was observed in the reaction C_2H with acetylene. The quantum yield is over one. This means that there are nano explosion occurs in the low temperature solid phase. It has a big meaning in the reaction mechanism of the unsaturated hydrocarbon expected to be radical in interstellar space or the planetary atmosphere.